Name_______________________________________________ Assignment 20 Practice – Redox Reactions CP2120 Fall 2020 Write the balanced chemical equation for each of the following reactions. Write the oxidation number for every element in the reactants and products. Identify which species is oxidized and which species is reduced. Write legibly, and use correct spelling, symbols, and units for full credit. ________ 1. Write the oxidation numbers for every element in all the species below.

a. ClO- b. ClO2- c. ClO3-

d. CO e. SO3 f. SO2

g. SO h. H2S i. NO3

j. NO2 k. NO l. NH3

m. NO2-

n. VO4-3 o. BO3-3

2. Write and balance the redox reactions below. Write the oxidation numbers for every element in all the species Identify which species is oxidized and which species is reduced.

a. Some aircraft generate nitrogen monoxide or nitric oxide (NO) at high altitudes due to the heat generated in jet engines. This NO reacts with ozone (O3) to form nitrogen dioxide and oxygen gases.

b. Calcium hydride (CaH2) reacts with titanium (IV) oxide to form titanium metal, solid calcium oxide, and hydrogen gas.

c. In a fuel cell hydrogen, energy is obtained from the reaction in which hydrogen gas reacts with oxygen gas to form water.

Key

i z 2 2 z z 4 z 3 2

anion molecular molecular molecular anioncompound compound compound3 2 6 2 ti z z z 5 2

anion molecular molecular molecular anioncompound compound compound5 2 4 z 6 z 3 I 13 2

anion molecular molecular molecular anioncompound compound compound

2 2 0 14 2 01NO t 03cg 7 Nodg 102cg

e gainsZee's reducedVat oxdzd

2 I 14 2 0 2 2 ofZCaHzG7t 110267 Tics ZCAOCD12 kzTigains4elredvcedoncHateseoxidzed

Thydrogenfuelcell0 0 I 2

2HzCg 10dg 2HzOgreducedlonc.lt

seseoxidzed